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Short-term effect of caffeine on olfactory function in hyposmic patients
Thomas Meusel1,2, Janine Albinus1, Antje Welge-Luessen3
1Smell and Taste Clinic, Department of Otorhinolaryngology, University of Dresden Medical School, Fetscherstr. 74, 01307, Dresden, Germany.
Summary
Caffeine consumption did not significantly improve olfactory function in patients with smell loss, regardless of the cause. This study found no short-term benefits of caffeine for improving smell in hyposmic individuals.
Area of Science:
- Otolaryngology
- Neuroscience
- Pharmacology
Background:
- Olfactory dysfunction, or smell loss, affects numerous individuals, impacting quality of life.
- Potential mechanisms for caffeine's effect on olfaction include adenosine receptor antagonism and phosphodiesterase inhibition.
- Understanding interventions for olfactory loss is crucial for patient care.
Purpose of the Study:
- To evaluate the short-term efficacy of caffeine in improving olfactory function in patients with smell loss.
- To investigate caffeine's effects in patients experiencing hyposmia due to upper respiratory tract infections (URTI) or sinonasal diseases.
Main Methods:
- A double-blind, placebo-controlled study was conducted with 76 patients diagnosed with hyposmia.
- Participants received either caffeinated or decaffeinated espresso.
- Olfactory function was assessed using the Sniffin' Sticks test before and 45 minutes after espresso consumption.
Main Results:
- No statistically significant difference in olfactory function was observed between the caffeine and placebo groups.
- Caffeine did not demonstrate a short-term effect on odor threshold or discrimination in patients with smell loss.
- These findings were consistent across participants with URTI-related and sinonasal-related hyposmia.
Conclusions:
- Caffeine, acting as a phosphodiesterase inhibitor and adenosine-receptor antagonist, shows minimal to no immediate impact on olfactory function in individuals with smell impairment.
- Current evidence suggests caffeine is not an effective short-term treatment for olfactory dysfunction in the studied patient population.
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